APA aipamena

Andreescu, T., & Gelca, R. (2010). Mathematical olympiad challenges. Springer.

Chicago Style aipamena

Andreescu, Titu, and Razvan Gelca. Mathematical Olympiad Challenges. New Delhi: Springer, 2010.

MLA aipamena

Andreescu, Titu, and Razvan Gelca. Mathematical Olympiad Challenges. Springer, 2010.